O-LevelMathematicsAlgebra and graphs4024/11 · Oct/Nov 2019 · Q193 Marks
f(x) = (5 - x) / x
- (a)Evaluate f(½).[1]
- (b)Find f⁻¹(x).[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.
- [1] 9
- [2] 5 / (x + 1)
- B1 for xy = 5 – x or for x = (5-y) / y
- or for 5/x = y + 1 or better
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